<?php

require_once 'HTMLPurifier/ChildDef/Required.php';

/**
 * Takes the contents of blockquote when in strict and reformats for validation.
 */
class   HTMLPurifier_ChildDef_StrictBlockquote
extends HTMLPurifier_ChildDef_Required
{
	var $real_elements;
	var $fake_elements;
	var $allow_empty = true;
	var $type = 'strictblockquote';
	var $init = false;
	function validateChildren($tokens_of_children, $config, &$context) {
		
		$def = $config->getHTMLDefinition();
		if (!$this->init) {
			// allow all inline elements
			$this->real_elements = $this->elements;
			$this->fake_elements = $def->info_content_sets['Flow'];
			$this->fake_elements['#PCDATA'] = true;
			$this->init = true;
		}
		
		// trick the parent class into thinking it allows more
		$this->elements = $this->fake_elements;
		$result = parent::validateChildren($tokens_of_children, $config, $context);
		$this->elements = $this->real_elements;
		
		if ($result === false) return array();
		if ($result === true) $result = $tokens_of_children;
		
		$block_wrap_start = new HTMLPurifier_Token_Start($def->info_block_wrapper);
		$block_wrap_end   = new HTMLPurifier_Token_End(  $def->info_block_wrapper);
		$is_inline = false;
		$depth = 0;
		$ret = array();
		
		// assuming that there are no comment tokens
		foreach ($result as $i => $token) {
			$token = $result[$i];
			// ifs are nested for readability
			if (!$is_inline) {
				if (!$depth) {
					 if (
						($token->type == 'text' && !$token->is_whitespace) ||
						($token->type != 'text' && !isset($this->elements[$token->name]))
					 ) {
						$is_inline = true;
						$ret[] = $block_wrap_start;
					 }
				}
			} else {
				if (!$depth) {
					// starting tokens have been inline text / empty
					if ($token->type == 'start' || $token->type == 'empty') {
						if (isset($this->elements[$token->name])) {
							// ended
							$ret[] = $block_wrap_end;
							$is_inline = false;
						}
					}
				}
			}
			$ret[] = $token;
			if ($token->type == 'start') $depth++;
			if ($token->type == 'end')   $depth--;
		}
		if ($is_inline) $ret[] = $block_wrap_end;
		return $ret;
	}
}

